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cond-mat.quant-gas2018★ 12 cited
Improved Silbey-Harris polaron ansatz for the spin-boson model
Shu He, Liwei Duan, Qing-Hu Chen
In this paper, the well-known Silbey-Harris (SH) polaron ansatz for the spin-boson model is improved by adding orthogonal displaced Fock states. The obtained results for the ground…
cond-mat.quant-gas2014
Quantum phase transitions of the spin-boson model within multi-coherent-states
Liwei Duan, Shu He, Qing-Hu Chen
A variational approach based on the multi-coherent-state ansatz with asymmetric parameters is employed to study the ground state of the spin-boson model. Without any artificial app…